diff --git a/src/gateware/zc706.py b/src/gateware/zc706.py
index 6f44d21..48edc61 100755
--- a/src/gateware/zc706.py
+++ b/src/gateware/zc706.py
@@ -716,7 +716,7 @@ class CXP_FMC():
                 print("CoaXPress at RTIO channel 0x{:06x}".format(len(rtio_channels)))
                 rtio_channels.append(rtio.Channel.from_phy(cxp_interface))
             else:
-                cxp_interface = cxp.CXP_Extension(phy, debug_sma_pad, pmod_pads)
+                cxp_interface = cxp.CXP_Extension(phy)
 
             setattr(self.submodules, cxp_name, cxp_interface)
             self.csr_devices.append(cxp_name)